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Paper   IPM / Astronomy / 13674
School of Astronomy
  Title:   dS solutions with co-dimension 2 branes in six dimensions
1.  H.R. Afshar
2.  H. Firouzjahi
3.  S. Parvizi
  Status:   Published
  Journal: Class.Quant.Grav
  Year:  2013
  Supported by:  IPM
We investigate phenomenological four-dimensional (4D) dS solutions with co-dimension 2 branes and finite 4D Planck mass in six dimensions. We present the conditions under which six-dimensional compactifications with holomorphic axion�??dilaton field or models with pure gravity with local sources can yield 4D dS solutions. Different classes of solutions are specified by a holomorphic function describing different embeddings of multiple conical branes. Depending on the local singularities of this holomorphic function and the topology of the compact dimension, one has to introduce 3-branes creating a deficit angle equal to �? and/or 4-branes with positive tensions

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